Simplify it all and get a hardware wallet. If on a budget, Ledger Nano S Plus is around $60 with a current promotion. Grab some steel/titanium seed backups.
Make a bootable USB with TAILS OS tails.net and run it live to use Ian Coleman and it comes with Electrum wallet. Make a new seed phrase with passphrases (or BIP-85) for additional wallets
Better to chose a Trezor T model for 64.5 USD
https://trezor.io/trezor-model-t
To OP
From what I understand, you are keeping your seed only in your head?
I don't recommend doing that, nor creating complicated methods for creating a wallet or strong password, because what makes sense to you today may not make sense in a few months, and you can easily forget it